Method and apparatus for perforating and/or severing tubular bodies

US5019028A · kind A · utility

Assignee

• Adalbert Engel · DE

Inventors

• Adalbert Engel · Lörrach, DE
• Christoph Engel · Bad Orb, DE
• Uta-Marie Engel · Lörrach, DE

Key dates

• Filing date: Jul 22, 1988
• Grant date: May 28, 1991
• Expiry date: Jul 22, 2008

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T83/9382
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

Tublar workpieces are formed with perforations of desired size and/or shape by repeatedly piercing selected portions of the workpieces by needles, pins or analogous piercing tools. The tools can be stationary while the workpieces roll therealong, or the workpieces can rotate while coming into repeated engagement with one or more sets of orbiting tools. The frequency and the number of penetrations of tools into selected portions of the workpieces are selected with a view to heat the tools as a result of frictional engagement with the material of the workpieces, i.e., as a result of repeated penetration into and extraction from selected portions of a rotating or rotating and rolling and/or axially moving workpiece. This enhances the making of predictable perforations in tubular workpieces, especially workpieces which consist of a synthetic thermoplastic material, such as bobbins for the storage of textile yarns. One or more knives can be provided to subdivide each discrete workpiece or a continuous tubular body into discrete sections of desired length.